Kashk Persian Style Whey.
with sour milk or yoghurt; in Iran, however, the same word also means dried buttermilk. Kashk comes in liquid or dried form (you reconstitute it with water), and is traditionally made with the milk left over from cheese-making..
In Turkey, kashk is a dried yoghurt product also known as keş peyniri, kurut, taş yoğurt, kuru yoğurt, or katık keşi.
Use as a substitute for sour cream, add to Aash (Persian Noodle Soup). Mix with chopped roasted eggplant, fried chopped onions, garlic, salt and pepper for a tasty appetizer.